Revert to using temp files for PalasoImage.FromFile
Revert to using temp files for PalasoImage.FromFile

The change did not work at all well on Linux: the copied Bitmap was
too different from the original Bitmap loaded from the file.

ermshiperete/libpalaso,glasseyes/libpalaso,andrew-polk/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,hatton/libpalaso,ddaspit/libpalaso,tombogle/libpalaso,gtryus/libpalaso,hatton/libpalaso,andrew-polk/libpalaso,glasseyes/libpalaso,JohnThomson/libpalaso,mccarthyrb/libpalaso,glasseyes/libpalaso,gtryus/libpalaso,gmartin7/libpalaso,gmartin7/libpalaso,JohnThomson/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,hatton/libpalaso,tombogle/libpalaso,ddaspit/libpalaso,JohnThomson/libpalaso,sillsdev/libpalaso,tombogle/libpalaso,hatton/libpalaso,tombogle/libpalaso,JohnThomson/libpalaso,andrew-polk/libpalaso,mccarthyrb/libpalaso,gtryus/libpalaso,mccarthyrb/libpalaso,glasseyes/libpalaso,mccarthyrb/libpalaso,sillsdev/libpalaso,ddaspit/libpalaso,ermshiperete/libpalaso,ddaspit/libpalaso,gtryus/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,andrew-polk/libpalaso